WAITING_FOR_SYNC
pkt->rx_state = WAITING_FOR_SYNC;
pkt->rx_state = WAITING_FOR_SYNC;
pkt->rx_state = WAITING_FOR_SYNC;
pkt->rx_state = WAITING_FOR_SYNC;
pkt->rx_state = WAITING_FOR_SYNC;
case WAITING_FOR_SYNC:
pkt->rx_state = WAITING_FOR_SYNC;
pkt->rx_state = WAITING_FOR_SYNC;
pkt->rx_state = WAITING_FOR_SYNC;